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3/4-0.75
21/0.75=28
3/4×5 - 26
(1×26)÷3/4×5
26÷15/4
26×15/4
6 14/15
3/4x+5=26
3/4x=26-5
3/4x=21 /: 3/4
x=28
3/4*28=21
21+5=26
Odp: Szukana liczba to 28. :)